Electric-arc lamp.



110,766,496, PATBNTBD ADa-2,1904.

A. s. DBEM.

ELECTRIC. 'ARG LAMP.

APPLIOATIOI FILED JAN. 26, 1904.

'Patented August 2, 1904.

UNITED STATES PATENT OEEICE.

ARTHUR S. DEEM, OF READING, PENNSYLVANIA.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 766,496, dated August 2, 1904.

Application filed January 26, 1904. Serial No. 190,679. (No model.)

To @ZZ whom t may concern:

Be it known that I, ARTHUR S. DEEM, a citi- Zen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

This invention relates to improvements in electric-arc lamps, the object being to produce a compact lamp, one that will throw no shadow beneath or around it, and onethat will consume the maximum of the carbons.

To this end I have constructed my lamp with a comparatively flat casing for housing the operating parts and a depending' globe, making a lamp little more than half the length of the ordinary arc-lamp.

In my present construction the carbons depend side by side from the casing into the globe and their lower ends are kept in nor mal contact until they have been consumed almost their entire length.

The invention is more fully described in the following speciiication and clearly illustrated in the accompanying drawing, which shows a vertical sectional view of my lamp.

The numeral 1 designates the casing, which is composed of two plates 1 and 2, between which are mounted the magnet and other operating parts.

The numeral l designates the magnet, and 5 is a yoke which surrounds the magnet.

6 indicates a dash-pot, of which there are two, one on either side, and which are connected to the yoke 5. This yoke 5 has two depending arms 7, which carry a cross-arm 8. To either end of this arm I have pivoted adepending arm 9, from which the arm 8 is insulated at 8. To the lower ends ot' each of these arms 9 I have pivotally mounted a carbon-holder 10, adapted to hold the carbon 11.

The upper inner corners of the holders 1() are pivoted to depending posts 12, secured to the lower plate 3 of the casing. The arms 9 move in slots 9l1 in the plate 3.

The numeral 13 indicates the resistancecoils.

The numerals 14 and 15 indicate the electrical connection.

The carbons will normally hang, as indicated in the drawing, at a slight angle and With their lower extremities contacting. This contact is made positive by the action of the magnet.

The yoke 5, tending to bear down the crossarm 8 through the upright 7 and the arms 9 on the ends of said cross-arm through their pivotal connection to the carbon-holders,will tend to press them toward each other. This pressure is of course very slight, only sufcient to guarantee contact, and as the carbon is consumed the contact is always followed up and is always positive until almost the entire length of the carbon has been consumed.

A central spring 17 may be arranged inside the magnet and connecting the cross-arm 8 to the top of the casing. By means of this spring the action of the carbons may be regulated, as the tendency to overcome too severe pressure one against the other may be regulated by the tension of this spring.

The dash-pot will of course tend to regulate the action of the parts to a great extent and prevent any unusual or sudden action.

From the center of the bottom plate 3 I depend a hanger 18, to which I secure a circular plate 19. To the outer edge of this plate I hang a depending globe 2() of suitable shape and size to inclose the carbons 11.

To the under side of the lower plate 3 of the casing I secure an outer or supplemental globe 21, which incloses the said inner globe 19. The result is a light with nothing to the sides or beneath the contacting points of the carbons to throw a shadow. The rays of light will be undisturbed and equal from all points.

The compact appearance of my lamp, as well as the fact that almost the entire carbons are consumed, thus insuring a lamp that will burn many hours longer than any other construction, are essential features of my invention.

Having thus fully described my invention, what I claim is- In an arc-lamp a casing comprising a magnet having electrical connections, a yoke surrounding said magnet, dash-pots connected to said yoke, a cross-arm carried by said yoke,

pivoted depending arms on the ends of said cross-arm, hangers depending` from the Casing, carbon-holders pivoted to said hangers In testimony whereof I have signed my name to this speoificatlon 1n the presence of two subscribing Witnesses.

and to said depending arms, oarbons secured l ARTHUR S. DEEM. in said holders adapted to be held in normal Contact at their lower ends by the action of said parts.

Witnesses:

C. H. HOLLEABACH, GEO. M. MILLER. 

